I am doing analysis of flow past circular cylinder. I am stagnation pressure value at different reynolds numbers. I am taking this from Total pressure infront of cylinder XY plot in FLUENT. Am I right doing this?

Also density value and velocity both equal to 1 in my simulation. Looking at experimental values I am getting nearly 0.5 less for every value. Do I need to add 0.5*density*velocity^2 value to pressure to get stagnation value. If not where I am going wrong?

I am already using a finer mesh and drag value for this mesh is close to experimental value. Pressure value is not changing much over refinement. Rest of all parameters are good like seperation point etc..